Special tera forms-
The pokemon all gain something made of crystal instead of a tera crown and the rest of them is not made of crystal. For example, Ceruledge and Armarouge get these forms,
getting a crystal blade and a crystal cannon respectively.
Moltres, Arcticuno, Thundrus and Tornadus are all given these special forms and are related to Walking Wake, Raging Bolt, Iron Crown and Iron Leaves
Paradoxes-
There's quite a few Paradox forms, many of which seem to be pairs of counterparts from each different region-
Past-
Beedrill, based on it's mega, ground/poison
Skarmory, resembles a dragon or gargoyle slightly resembling Aerodactyl, and with a much more scythe-like version of its tail, steel/dragon
Mightyena, has long white fur and menacing eyes hidden by shadow, dark/ice
Rotom, takes the appearance of a possessed stone relic vaguely resembling Claydol and Baltoy, with Rotom's eyes and grin, ghost/rock
Chandelure, apppears to be a purple flame with the same eyes surrounded by other purple flames floating around it, as though the chandelier came later, fire/psychic
Aromatisse, appears to be a more traditional plague doctor exusing toxic gasses likely in reference to the "miasma theory" of antquity, poison/fairy
Komala, appears to be based on the "Drop-bear", an Australian hoax regarding giant, ferocious Koalas, having sharp fangs and carrying around a large log that it plants in the ground to drop from, dark/normal
Frosmoth, is covered almost completely in snow and ice with two glowing eyes showing and wings coming out from the back, ice/flying
Lechonk, appears to be a much more wild boar with tusks, horns, shaggy fur and angry eyes, normal/fighting
You also have the beasts and swords
Will add Violet paradoxes